I disagree with your point completely. Sure, in complicated mathematics, you may need to have lots of named entities floating around, and it can sometimes be hard to keep them straight. However, many mathematicians actually take great care, and put a lot of thought and effort, in to choosing how to name their variables, functions, spaces, measures, operations, etc.
One facet of this is trying to be consistent with convention -- if $\mu$ is always used to represent a measure in an analysis context, then calling your measure $\mu$ will make it quite easy to remember what $\mu$ stands for when you see it pop up.
The next part of this effort is to ensure that the definitions of our entities stand out in the text (for instance, even typesetting them as "Definition: ...", as well as reminding the reader of definitions for symbols that are used throughout an entire work.
The last thing I'll mention is this: well-written mathematics usually relies more on words than on masses of symbols strung together to form equations. Of course there will be equations in most types of mathematics... but unlike a Calculus student's homework solutions, a mathematical paper will be made up of far more prose than typeset equations.